Posted By:
Brian T.As I understand it, mold needs three things to grow...
1- A food source (cardboard works just fine, as does the paper facing on drywall).
2- A source of moisture in order to elevate the moisture level to above 20% of the wood moisture equivalent.
3- Oxygen.
Without all three, mold will not grow.
So, if the source of moisture is eliminated and the card is dried out, mold will not continue to grow. That is not to say that the existing mold will go away, but new molds will not begin to grow. So, if you are only concerned about the card not worsening in condition (by having new growths) simply eliminating the moisture will suffice. In terms of treating the existing mold, I will yield to the other card experts as to what is appropriate.
As an aside, I am not sure how airtight slabs are, but if it is airtight, the slab will eliminate (or limit) the presence of oxygen - that will also curtail new growth.